This paper shows prospects for child poverty in Great Britain, as defined by the current British government, in 2010/11 and 2020/21 under various demographic, economic and policy scenarios. It uses a static micro-simulation model, with projections of some key economic and demographic characteristics. It shows prospects for child poverty in Great Britain in 2010/11 and 2020/21 under current government policies, and quantifies the impact of possible tax and benefit changes that could be implemented by 2010 and 2020.